N18.32
BillableChronic kidney disease, stage 3b
HCC Category Mapping
V28HCC 328 — Chronic Kidney Disease, Stage 3
0.416V24HCC 138 — Chronic Kidney Disease, Moderate (Stage 3)
0.000ESRDHCC 138 — Chronic Kidney Disease, Moderate (Stage 3)
0.000What This Code Means
Stage 3b chronic kidney disease where kidney function is moderately to severely decreased with a GFR of 30-44, representing the more severe end of stage 3.
Coding Tips
- •Confirm GFR range of 30-44 mL/min/1.73m² is documented to differentiate from stage 3a
- •Patients at this stage often require closer monitoring and preparation for potential progression to stage 4
Clinical Significance
Stage 3b chronic kidney disease represents moderate to severe kidney function decline (GFR 30-44) requiring active nephrology management and preparation for renal replacement therapy. This diagnosis indicates more advanced CKD with increased cardiovascular risk and potential progression to end-stage disease.
Documentation Requirements
- ✓Chronic kidney disease stage 3b specifically documented
- ✓GFR values in the 30-44 range supporting stage 3b classification
- ✓Active nephrology management or consultation documented
- ✓Assessment for preparation for renal replacement therapy
- ✓Cardiovascular risk management plan
- ✓Underlying etiology of CKD documented
- ✓Patient education regarding CKD progression and treatment options
Commonly Confused Codes
Code Hierarchy
└N18Chronic kidney disease (CKD)└N18.3Chronic kidney disease, stage 3 (moderate)└N18.32Chronic kidney disease, stage 3b
└N18.32Chronic kidney disease, stage 3b